body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f6f9;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
}

.header h1 {
    color: #333;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 10px;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.header-actions button {
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    color: #fff;
    font-size: 14px;
    cursor: pointer;
}

.refresh-button {
    background-color: #007bff;
}

.export-button {
    background-color: #28a745;
}

canvas {
    max-width: 100%;
    margin: 0 auto;
    display: block;
}

ul {
    list-style-type: none;
    padding: 0;
    margin: 20px 0 0;
}

ul li {
    padding: 15px;
    margin-bottom: 10px;
    background: #ffffff;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    font-size: 16px;
    color: #555;
}

ul li:nth-child(odd) {
    background: #f9f9f9;
}

.hidden-button {
    position: absolute;
    top: 10px;
    left: 10px;
    width: 40px;
    height: 40px;
    opacity: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1000;
}

.hidden-button::after {
    content: '🗎'; /* 可以替换为图标 */
    font-size: 24px;
    color: #007bff;
}
